Low- and high-molecular weight amorphous polyalphaolefin polymer blends having high melt viscosity, and products thereof

Abstract

A polymer blend having an open time including a high molecular weight average, predominantly atactic flexible polyolefin polymer having a heat of fusion of about 15 to 60 J/g, and a low molecular weight average, atactic polyolefin polymer having a heat of fusion of about 0.1 to 20 J/g, wherein the high molecular weight polymer and low molecular weight polymer are sufficiently miscible to impart a single glass transition temperature to the polymer blend, and the low molecular weight polymer is present in an amount sufficient to impart a melt viscosity of greater than about 8,000 cPs at room temperature and a crystallinity below about 25 J/g to the polymer blend. The invention further includes methods for preparing such polymer blends, and the products produced from the polymer blends, which are useful for hot melt adhesives, asphalt and bitumen applications such as roofing membranes, polymeric modifiers and the like.

Dependencies are inferred from the claim text.